1

我有一个 ViewController，在此我添加了一个名为 DrawingView 的自定义 UIView。我想在这个 DrawingView 中添加 UITextView 的动态数量，所以我将 UITextView 子类化为类名为 CustomTextView。在 ViewController 我有以下代码将 textview 添加到 DrawingView。

- (void)viewDidLoad
{
    [super viewDidLoad];
    DrawingView * newDrawingView = [[DrawingView alloc]init];
    self.drawingView = newDrawingView ;
}

-(void)setDrawingView:(DrawingView *)_drawingView
{  
    if (drawingView != _drawingView)
    {        
        [drawingView removeFromSuperview];
        drawingView = _drawingView;
        drawingView.customDelegate = self;
        drawingView.frame = scrollView.bounds;    
        drawingView.layer.cornerRadius = 8;
        drawingView.backgroundColor = [UIColor whiteColor];
        drawingView.clipsToBounds = YES;

        [self.view addSubview:drawingView];
    }
}

在按钮操作上，我在绘图视图中添加了 CustomTextView。

currentText = [[TextViewContainer alloc]init];
[drawingView currentText];

现在我想归档这个 DrawingView 连同它的子视图，即 CustomTextView。所以在 CustomTextView 我添加了 NSCoding 协议并在其中添加了属性

- (id)initWithCoder:(NSCoder *)aDecoder
{
     if ((self  =  [super initWithCoder:aDecoder]))
     {
         self.layer.borderWidth  =  [aDecoder decodeFloatForKey: @"borderWidth"] ;
     }
}

- (void)encodeWithCoder:(NSCoder *)aCoder
{
    [aCoder encodeFloat:self.layer.borderWidth forKey:@"borderWidth"];
}

上述方法中还有其他自定义属性。对于存档，我使用以下方法。

- (NSData *)dataForView:(UIView *)view:(NSString *)fileName
{

    NSMutableData *data = [NSMutableData data];
    NSKeyedArchiver  *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
    [archiver encodeObject:view forKey:fileName];
    [archiver finishEncoding];

    return (id)data;
}


-(void)saveChangesInFile :(NSString *)fileName
{
    NSData *data = [self dataForView:drawingView:fileName];

    NSString *docsDirectory  =  [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];

    NSString *dataPath  =  [docsDirectory stringByAppendingPathComponent:@"/.hidden"];

    if (![[NSFileManager defaultManager] fileExistsAtPath:dataPath])
    {
        [[NSFileManager defaultManager] createDirectoryAtPath:dataPath withIntermediateDirectories:NO attributes:nil error:nil];
    }

    NSString *pathes  =  [dataPath stringByAppendingPathComponent:fileName];

    [data writeToFile:pathes atomically:YES];
}


- (UIView *)viewForData:(NSData *)data:(NSString*)key
{
    NSKeyedUnarchiver  *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];

    UIView *view = [unarchiver decodeObjectForKey:key];

    [unarchiver finishDecoding];

    return view;
}

-(void)openSavedFileWithName:(NSString*)fileName{

    NSString *docsDirectory  =  [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];

    NSString *dataPath  =  [docsDirectory stringByAppendingPathComponent:@"/.hidden"];
    NSString *filepath = [dataPath stringByAppendingFormat:@"/%@",fileName];
    NSData *data = [NSData dataWithContentsOfFile:filepath];

    if (data)
    {    
        UIView *newDrawView = [self viewForData:data:fileName];
    }
    NSLog(@"neew :%@",newDrawView.subviews);
    self.drawingView = (DrawingView *)newDrawView ;
    NSLog(@"self.drawingView :%@",self.drawingView.subviews);
}

但我得到子视图数组为零。任何人都可以帮助我吗？

4

1 回答 1

2

认为您正在尝试归档视图本身。

[archiver encodeObject:view forKey:fileName];

我认为它是错误的。您不能归档任何 UI 组件，但只能归档模型。例如，您可以将模型（包括特定视图的大小、颜色和背景图像）保存到数据库中，但不能将视图本身保存到数据库中。同样对于归档，您需要归档其数据（即、数组、图像等），而不是 UI 组件本身。

查看NSKeyedArchiver ClassReference了解更多详细信息。另外，请查看链接以获取详细说明。谢谢。

于 2012-06-19T06:34:34.933 回答